Bit/Word Definitions For The Block Transfer Write Words For The Frequency Input Module - Allen-Bradley FLEX I/O 1794-IJ2 User Manual

4-6 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
(Octal Bit) 17 16
Dec. Bit 15 14
WOFG WOFF
6
Ch 1 Ch 1
Where: CF = Communication fault
SSM = Safe state mode
FR = Frequency Range
MPM = Missing Pulse Multiplier
LF = Local fault mode
F/AAS = Frequency/Accel alarm select
WOFF = Wire-off fault frequency
WOFG = Wire-off fault gate
WOFM = Wire-off fault mode
IGI = Invert gate input
IFI = Invert frequency input
ACT = Acceleration Calculation Time
MPDM = Missing pulse delay multiplier
R = Reserved
Word Bit
Missing pulse multiplier bits (channel 1) – used to modify the Minimum Frequency Sampling Time to allow the frequency
bandwidth to be more closely adjusted to the value needed to report the proper frequency and report a missing pulse
more quickly.
Default = no multiplier; alarm generated immediately
Bits 00-01
Number of pulses to terminate sampling (channel 1) – Lets you calculate Frequency when a specified number of input
pulses have occurred. This allows earlier reporting of the frequency than the Minimum Frequency Sampling Time, when
many input pulses are occurring. Accurate frequency determination is possible without waiting for the full Minimum
Write
Frequency Sampling Time to expire.
Word 0
Default = minimum frequency sampling time.
Bits 02-04
Publication 1794-6.5.11 - November 1997
15 14 13 12
13 12 11 10
Minimum Frequency
IGI IFI
Sample Time
Ch 1 Ch 1
Bit/Word Definitions for the Block Transfer Write Words for the
Frequency Input Module
Bit 01 00 Missing Pulse Multiplier
0 0 No Multiplier, normal mode with 2s delay
0 1 X2
1 0 X8
1 1 X32
Bit 04 03 02 Number of pulses to terminate sampling
0 0 0 Use minimum frequency sampling time
0 0 1 2
0 1 0 4
0 1 1 8
1 0 0 16
1 0 1 32
1 1 0 64
1 1 1 128
11 10 07 06
09 08 07 06
Init St
Up
ACT Ch 1
Ch 1 Ch 1
Definition
05 04 03 02
05 04 03 02
F/A AS MPDM
Ch 1 Ch 1
01 00
01 00
WOFM
Ch 1